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phase 3 purchase, no phase 3 power.

05-16-2013, 12:29 AM

I just purchase a Grizzly G0450z 37" drum sander that comes with phase 3 power. What are my options for changing to 220v power? It has a 15hp motor. Got it at an estate sale for 900 bucks, so I have a little wiggle room with money.

Without swapping the motor to a single phase unit, your only option would be some type of phase converter. The converter will run you some bucks as well as a motor. Although not as efficient and are not the best option, static converters are going to be the cheapest and basicly energize the third leg to start the motor and then drop out leaving it too the two 110v legs. You lose the power advantages of 3 phase, but it does work. My dad has been running one on his 7hp powermatic 10" table saw for close to 20 years.

Comment

if it starts under load you need a rotary converter that is started at least 15 seconds before the 3 phase motor starts, but a no load can use a three phase static converter,

a rotary converter is basically a larger motor than what you have to run that is started by static converter,
and the rotation in the motor acts like a transformer and created the third phase, for a 15 HP motor one would probably need a 25 hp motor for the converter.

now there is a way of by passing the static converter by using a small single phase starter motor that is operated by a monetary switch, to gain rotation on the converter, there are plans on the net for details,

using a static converter you need to derate the motor by a 1/3, your only using 2/3 of the motor

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Comment

A friend bought a SS Meat slicer with a three phase motor. I used a submersible pump control box to start the motor and it worked like a charm. You just have to lighten up on the load because like BHD said, you're only going to be getting 2/3 of the horsepower. If you bog it down to where it stops, it won't start again unless the control box stays in line.

Comment

You woke me up, Rick, hadn't noticed the member profile. Not to many of us Idaho guys on here. Still so few of us that have sold our horses and six-guns, and it's such a pain in the arse to ride 5 miles of trail to the general store to use their connection to the outside world.

If a person can find a old 20/25 hp 3 phase motor and use a static converter to start it and then let the motor to transform the single phase power to three phase you could possibly save your self a lot of money on "making your own rotary converter" (use proper static for the idle/transformer motor) and should be about a 1/3 larger than the motor to drive.

Push sticks/blocks Save Fingers
~~~~~~~~~~~~~~~~~~~
"The true measure of a man is how he treats someone who can do him absolutely no good."
attributed to Samuel Johnson
~~~~~~~~~~~~~~~~~~~
PUBLIC NOTICE: Due to recent budget cuts, the rising cost of electricity, gas, and oil...plus the current state of the economy............the light at the end of the tunnel, has been turned off.